Arsenic in Skull Valley, AZ Drinking Water
Arsenic data for Skull Valley, Arizona · 42,217 residents · 1 ZIP code
EPA records show Arsenic detections in Skull Valley, Arizona water samples.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Arsenic in Skull Valley Tap Water
Arsenic has been detected in Skull Valley, Arizona drinking water at a maximum level of 8 ppb — below the EPA MCL of 10 ppb.
This analysis covers 42,217 residents across 1 ZIP code in Skull Valley.
Skull Valley's overall water quality grade is D (53/100).
Is Arsenic in Skull Valley Water Safe?
Arsenic was detected in Skull Valley water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.
If you are concerned, a reverse osmosis filter can reduce arsenic levels further.
Arsenic Levels by ZIP Code
| ZIP Code | Arsenic Level | EPA Limit | Status |
|---|---|---|---|
| 86338 | 8 ppb | 10 ppb | OK |
Average arsenic level across Skull Valley: 8 ppb
Health Effects of Arsenic
- Increased risk of skin, bladder, lung, and kidney cancer
- Cardiovascular disease and type 2 diabetes
- Skin changes (darkening, thickening, lesions)
- Developmental effects in children exposed in utero
Health risk severity: High. Governed by the Arsenic Rule (2006).
How Arsenic Gets Into Drinking Water
- Natural deposits in rock and soil (especially in western U.S.)
- Runoff from orchards and glass/electronics production
- Historical use of arsenic-based pesticides
- Well water in areas with arsenic-rich geology
What to Do About Arsenic in Skull Valley Water
- Install a reverse osmosis (RO) system certified under NSF 58
- Adsorptive media filters (iron-based) can also reduce arsenic
- Have well water tested if on a private supply
- Boiling water does NOT remove arsenic — it concentrates it
Look for filters certified under NSF 53 / NSF 58 for arsenic removal.